When braking vehicle will accelerate for a brief 1-2 seconds then go back to braking, causing sudden jolts forward and increase distances needed to stop the vehicle, this was only noticed recently in the last 6 months and are at 20K miles as of July 2024, but is becoming more and more frequent, this happened twice on 7/8/2024

- Wake Forest, NC, USA

While slowing down to about 10mph to turn, brakes suddenly disengage and the car lurches forward. This happens every day, sometimes multiple times a day.

- Portland, OR, USA

Problem with regenerative braking while braking. When coming to a stop the regenerative braking is engaged and sometimes the regenerative braking disengages before a complete stop causing a change in required braking force to stop the vehicle. This can cause a sudden jerk of the vehicle when having to press the brakes harder which can cause a whiplash movement.

- Bridgeton, MO, USA

I turned right to park behind another car on the driveway and my car suddenly accelerated hitting the car in front. The collision was strong enough that the car that was hit then hit a barrier at the home.

- Vallejo, CA, USA

When going down hill and needing to brake at a stop sign the brakes feel like they release for a second causing me to move further forward than expected. When I press further on the brake peddle they seem to engage again. Concerning since I'm going into a stop sign at the bottom of hill. The sensation is as if I'm slipping on ice and loosing the ability to brake before they engage again. I have to drive this everyday and has happened several times but not able to replicate it and the dealer has not been able to reproduce it, therefore nothing is wrong according to them. No warning lights appear. The brakes have not been inspected since the dealer feels there is nothing wrong. If I'm ever not able to get the brakes to re-engage then I will run the stop sign and off the embankment on the other side.

- Golden, CO, USA

Approximately 4-5 times it has felt like the brakes have slipped or let go for a very brief moment. I have either been braking over bumps, or braking going downhill. It is a slipping feeling, like is felt when briefly sliding on a patch of ice, or hydroplaning. It occurs for only a second or two. It has happened when conditions were dry.

- Hudson, NH, USA

UNKNOWN. Randomly, while lightly braking, the vehicle will lunge forward. Does not always happen and unable to recreate it but has almost caused a few accidents. Van lunges forward for a second or so and then the brakes will re-catch or work again and the vehicle slows again. Scary. Have gone to toyota dealership but they insist nothing is wrong and they haven't heard of this issue. Forums with other Sienna hybrid owners state the same issue. Unsafe. Has happened multiple times, happened twice this last week.

- Aumsville, OR, USA

While driving slowly into a parking slot, the brakes released and the vehicle surged over a parking block and into a sign. On a couple of time previously, I have encountered similar situations but never when parking at slow speed.

- San Antonio, TX, USA